package com.qk.filter;

import com.qk.utils.CurrentUserHoler;
import com.qk.utils.JwtUtils;
import io.jsonwebtoken.Claims;
import jakarta.servlet.*;
import jakarta.servlet.http.HttpServletRequest;
import jakarta.servlet.http.HttpServletResponse;
import lombok.extern.slf4j.Slf4j;

import java.io.IOException;
//过滤器
//@WebFilter(urlPatterns = "/*")
@Slf4j
public class TokenFilter implements Filter {
    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;
        //1.获取请求路径
        String uri=request.getRequestURI();
        //2.判断请求路径是否包含：login,如果是,放行
        if(uri.contains("login")){
            log.info("登录请求:{},放行",uri);
            filterChain.doFilter(request,response);
            return;
        }
        //3.获取请求头 token
        String jwt = request.getHeader("token");
        //4.判断token是否存在,如果不存在返回401状态码
        if(jwt==null||jwt.isEmpty()){
            log.info("请求头token为空");
            response.setStatus(401);
            return;
        }
        //5.解析令牌,如果令牌报错,返回401状态码
        try {
            Claims claims = JwtUtils.parseToken(jwt);
            Integer id = claims.get("id", Integer.class);
            log.info("当前用户ID存入ThreadLocal");
            CurrentUserHoler.setCurrentUser(id);
        }
        catch (Exception e){
            log.info("令牌解析失败");
            response.setStatus(401);
            return;
        }
        //6.放行
        filterChain.doFilter(request,response);
        //7.释放资源
        log.info("删除ThreadLocal中的用户信息资源");
        CurrentUserHoler.removeCurrentUser();
    }
}
